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Abstract

A computing apparatus (1000) for and method (100) of characterising a subsurface reservoir is disclosed. The method comprises: (i) receiving data representing a geological model of a reservoir (S1), the reservoir model comprising a plurality of grid-cells, where the reservoir model is divided into the said grid-cells, and a location or locations of one or more boreholes within the reservoir being modelled; (ii) receiving data representing a specification reservoir parameters for generating geological realisations of the modelled reservoir (S2); (iii) calculating the volume and pressure of each fluid phase in each grid-cell from the reservoir parameters a plurality of discrete time points, wherein a property of the grid-cells or the time points are not uniform amongst all the grid-cells (20); (iv) calculating the flux of each fluid phase between grid-cells and boreholes for each time point from the calculated volumes and pressures (S3); (v) calculating borehole production for each borehole from the calculated fluxes (36).

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First Claim